<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    uni-app {
      display: block;
      box-sizing: border-box;
    }
    uni-app {
      width: 100%;
      height: 100%;
    }
    uni-page {
      display: block;
    }
  </style>
</head>
<body>
  <uni-app>
    <span>123456</span>
    <span>890</span>
    <uni-page>789</uni-page>
  </uni-app>
</body>
</html>